<template>
  <div id="cube">

  </div>
</template>

<script>
import * as echarts from 'echarts/core'
import { CustomChart } from 'echarts/charts'
import { getVehicleVolume } from '@/api/express'
echarts.use([CustomChart])
const offsetX = 20
const offsetY = 10
// 绘制左侧面
const CubeLeft = echarts.graphic.extendShape({
  shape: {
    x: 0,
    y: 0
  },
  buildPath: function (ctx, shape) {
    // 会canvas的应该都能看得懂，shape是从custom传入的
    const xAxisPoint = shape.xAxisPoint
    // console.log(shape);
    const c0 = [shape.x, shape.y]
    const c1 = [shape.x - offsetX, shape.y - offsetY]
    const c2 = [xAxisPoint[0] - offsetX, xAxisPoint[1] - offsetY]
    const c3 = [xAxisPoint[0], xAxisPoint[1]]
    ctx.moveTo(c0[0], c0[1]).lineTo(c1[0], c1[1]).lineTo(c2[0], c2[1]).lineTo(c3[0], c3[1]).closePath()
  }
})
// 绘制右侧面
const CubeRight = echarts.graphic.extendShape({
  shape: {
    x: 0,
    y: 0
  },
  buildPath: function (ctx, shape) {
    const xAxisPoint = shape.xAxisPoint
    const c1 = [shape.x, shape.y]
    const c2 = [xAxisPoint[0], xAxisPoint[1]]
    const c3 = [xAxisPoint[0] + offsetX, xAxisPoint[1] - offsetY]
    const c4 = [shape.x + offsetX, shape.y - offsetY]
    ctx.moveTo(c1[0], c1[1]).lineTo(c2[0], c2[1]).lineTo(c3[0], c3[1]).lineTo(c4[0], c4[1]).closePath()
  }
})
// 绘制顶面
const CubeTop = echarts.graphic.extendShape({
  shape: {
    x: 0,
    y: 0
  },
  buildPath: function (ctx, shape) {
    const c1 = [shape.x, shape.y]
    const c2 = [shape.x + offsetX, shape.y - offsetY]
    const c3 = [shape.x, shape.y - offsetX]
    const c4 = [shape.x - offsetX, shape.y - offsetY]
    ctx.moveTo(c1[0], c1[1]).lineTo(c2[0], c2[1]).lineTo(c3[0], c3[1]).lineTo(c4[0], c4[1]).closePath()
  }
})
// 注册三个面图形
echarts.graphic.registerShape('CubeLeft', CubeLeft)
echarts.graphic.registerShape('CubeRight', CubeRight)
echarts.graphic.registerShape('CubeTop', CubeTop)

const VALUE = []

const option = {
  tooltip: {
    trigger: 'axis',
    axisPointer: {
      type: 'shadow'
    },
    formatter: function (params, ticket, callback) {
      const item = params[1]
      return item.name + ' : ' + item.value
    }
  },
  grid: {
    left: '10%',
    right: '10%',
    top: '15%',
    bottom: '10%',
    containLabel: true
  },
  xAxis: {
    type: 'category',
    data: [],
    axisLine: {
      show: true,
      lineStyle: {
        width: 2,
        color: '#2B7BD6'
      }
    },
    axisTick: {
      show: false
    },
    axisLabel: {
      fontSize: 30,
      color: '#A3A5A6'
    }
  },
  yAxis: {
    type: 'value',
    axisLine: {
      show: true,
      lineStyle: {
        width: 2,
        color: '#2B7BD6'
      }
    },
    splitLine: {
      show: true,
      lineStyle: {
        color: '#153D7D'
      }
    },
    axisTick: {
      show: false
    },
    axisLabel: {
      fontSize: 14
    }
  },
  series: [
    {
      type: 'custom',
      renderItem: (params, api) => {
        const location = api.coord([api.value(0), api.value(1)])
        return {
          type: 'group',
          children: [
            {
              type: 'CubeLeft',
              shape: {
                api,
                xValue: api.value(0),
                yValue: api.value(1),
                x: location[0],
                y: location[1],
                xAxisPoint: api.coord([api.value(0), 0])
              },
              style: {
                fill: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
                  {
                    offset: 0,
                    color: '#33BCEB'
                  },
                  {
                    offset: 1,
                    color: '#337CEB'
                  }
                ])
              }
            },
            {
              type: 'CubeRight',
              shape: {
                api,
                xValue: api.value(0),
                yValue: api.value(1),
                x: location[0],
                y: location[1],
                xAxisPoint: api.coord([api.value(0), 0])
              },
              style: {
                fill: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
                  {
                    offset: 0,
                    color: '#28A2CE'
                  },
                  {
                    offset: 1,
                    color: '#1A57B7'
                  }
                ])
              }
            },
            {
              type: 'CubeTop',
              shape: {
                api,
                xValue: api.value(0),
                yValue: api.value(1),
                x: location[0],
                y: location[1],
                xAxisPoint: api.coord([api.value(0), 0])
              },
              style: {
                fill: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
                  {
                    offset: 0,
                    color: '#43C4F1'
                  },
                  {
                    offset: 1,
                    color: '#28A2CE'
                  }
                ])
              }
            }
          ]
        }
      },
      data: VALUE
    },
    {
      type: 'bar',
      label: {
        normal: {
          show: true,
          position: 'top',
          formatter: (e) => {
            return e.value
          },
          fontSize: 16,
          color: '#43C4F1',
          offset: [0, -25]
        }
      },
      itemStyle: {
        color: 'transparent'
      },
      tooltip: {},
      data: VALUE
    }
  ]
}
let _myChart = null

export default {
  data() {
    return {
      xData: [],
      value: []
    }
  },
  mounted() {
    const chartDom = document.getElementById('cube')
    _myChart = echarts.init(chartDom)
    getVehicleVolume().then(res => {
      if (res?.success) {
        const { volume = [] } = res.result || {}
        const xs = []
        const ys = []
        volume.forEach(item => {
          xs.push(item.xcoordinate)
          ys.push(item.ycoordinate)
        })
        this.xData = xs
        this.value = ys

        option.xAxis.data = xs
        option.series[0].data = ys
        option.series[1].data = ys
        option && _myChart.setOption(option)
      }
    })
    option && _myChart.setOption(option)
  }
}
</script>

<style lang="less">
  #cube {
    width: 1364px;
    height: 586px;
    margin-top: 126px;
  }
</style>
